One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,9,11)(7,8,12,10)(13,14,17,18)(15,16,19,20)(22,25)(26,27)(2,4)(5,7,9,12)(6,10,11,8)(14,18)(15,19)(21,22)(23,26)(24,25)(27,28)(1,2)(3,4)(6,11)(7,12)(13,15)(14,16)(17,19)(18,20)(21,22,24,25)(23,26,28,27)(5,8)(6,7)(9,10)(11,12)(13,15)(14,16)(17,19)(18,20)(21,23,24,28)(22,26,25,27)(5,6)(7,10)(8,12)(9,11)(13,16)(14,19)(15,18)(17,20)(21,22)(23,27)(24,25)(26,28) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.